Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. These 8-bit shift registers feature gated serial inputs and an asynchronous clear. A low logic level at either input inhibits entry of the new data, and resets the first. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, 8-Bit Serial In/Parallel Out Shift Register.

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See this answer to a previous topic, for more info. Hold Time, Clock to A1 or A2.

IC Datasheet: 74LS164 Data Sheet

You might simply datasheet 74ls164 a logic level compatibility issue between Pi and the LS inputs. Low Level Output Voltage.

You should test with the FETs in place. Search field Part name Part description.

Functional operation should datasheet 74ls164 restricted to the Recommended Operating Conditions. I know there is a pull down and a pull up in the raspberry pi when you configure the GPIO as input, but is there a pull down when you are in output mode? Data datasheet 74ls164 the serial inputs may be changed while the clock is high datashset low, but only information meeting the setup requirements will be entered clocking occurs or the low-to-high level transition of the clock input.

Then I send a clock pulse from 74l164 Raspberry Pi go high for ms then go low.

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74LS Datasheet(PDF) – Fairchild Semiconductor

Low Level Input Current. By using our site, you acknowledge that you have read and understand our Datasheet 74ls164 PolicyPrivacy Policyand our Terms of Service. Have you ever had bounce problems using a simple microcontroller DIO, especially at low freq? Thus exceeding operating conditions, all bets are off. datasheet 74ls164

Maximum Datasheet 74ls164 are those values beyond which damage to the device may occur. I resolved my problem. If your wires are already short, then consider adding a signal integrity resistor ohms in series with the clock pin as close to the driver as possible.

raspberry pi – 8-bit shift register 74LS not working – Electrical Engineering Stack Exchange

All diodes are 1N or 1N You are probably getting multiple pulses instead of datasheet 74ls164 one. Not more than one output should be shorted at a datasheet 74ls164, and duration should not exceed one second. The length of your clock wire might be a factor in this. High Level Output Current. FiddyOhm Reading the datasheet here, I can’t find an issue with the logic levels.

Questions Tags Users Badges Unanswered. Propagation Delay Time, Reset to Q. Hasn’t ever happened to me. You have an unexplained 1V offset. Looks pretty clean but datasheet 74ls164 need to zoom way in to know for sure. Post as a guest Name.

Propagation Delay Time, Clock to Q. The thresholds are 0. High Level Output Voltage. James Magnus 55 7.

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By clicking “Post Your Datasheet 74ls164, you acknowledge that you have read our updated terms datasheet 74ls164 serviceprivacy policy and cookie policyand that dtaasheet continued use of the website is subject to these policies. That’s a good guess, but the recent oscilloscope pictures posted after your answer looks pretty clean.

Sign up using Email and Password. The measurement or what I think is the measurement number in all the screen shots says 3. When I power-on the circuit, all the LEDs datasheet 74ls164 off. Sign up using Facebook. Dwtasheet, the pulse has a ragged edge s and the is actually clocking several datasheet 74ls164.

Output mode is push-pull with at least 2mA sink capability. When the asker is sourcing more datasheet 74ls164 the chip can do by more than datasheet 74ls164 factor of 10, I’d look there first.

All inputs are diode- clamped to minimize transmission-line effects. The register was clocking multiple times 7ls164 the clock signal wasn’t enough clean. Take a peek at the data sheet. I use leds to see what happen. This chip can’t drive the kind of current you want it to. This site uses cookies datasheet 74ls164 deliver our services and to show you relevant ads and job listings.